HELP PLEASE! gp1200 carb tuning/ venturi dribble

[Grayson]

Hello all! I have a customers 1998 Yamaha gp1200. I just rebuilt the whole engine and used OSD oem mikuni carb kits. The ski starts right up and sounds very healthy, however , I pull the plugs and they are dry and white (not good, extremely lean). I have backed the fuel screws out past stock and my pop off is around 55-60psi with shiny silver springs (stocks are dull silver). I do have venturi dribble but would't that cause a rich issue? I have done 7 of these yami triples now but this one is kicking my ass! Any help would be appreciated as I'm stumped!

 

[POPPS]

yes,,,venturi drip causes rich idle,,,usually caused by popoff too low,,, vibrating motor,,,sometimes adding a second anti-syphon valve solves it.

 

[Grayson]

yes,,,venturi drip causes rich idle,,,usually caused by popoff too low,,, vibrating motor,,,sometimes adding a second anti-syphon valve solves it.

The 98 gp1200 calls for 1.2 n/s with 95g dull silver spring for a pop off of around 65-70psi. The springs that came out of it were shiny silver 65g.
I have the proper springs and 6x check valves to double them up on the way. Hopefully I can get this thing back on the water for the customer for one more ride this season..